621530612 has 6 divisors (see below), whose sum is σ = 1087678578. Its totient is φ = 310765304.

The previous prime is 621530561. The next prime is 621530627. The reversal of 621530612 is 216035126.

It can be written as a sum of positive squares in only one way, i.e., 442934116 + 178596496 = 21046^2 + 13364^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77691323 + ... + 77691330.

It is an arithmetic number, because the mean of its divisors is an integer number (181279763).

Almost surely, 2^621530612 is an apocalyptic number.

It is an amenable number.

621530612 is a deficient number, since it is larger than the sum of its proper divisors (466147966).

621530612 is a wasteful number, since it uses less digits than its factorization.

621530612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155382657 (or 155382655 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 621530612 is about 24930.5156785815. The cubic root of 621530612 is about 853.4030183299.

Adding to 621530612 its reverse (216035126), we get a palindrome (837565738).

The spelling of 621530612 in words is "six hundred twenty-one million, five hundred thirty thousand, six hundred twelve".